Takuji Nomura, Hyogo JP

Takuji Nomura, Hyogo JP

Patent application number

Description

Published

20090148247

GUN DRILL - A gun drill having excellent cutting efficiency, having high deep-hole drilling efficiency, and having a prolonged blade service life has a cutter head having a coolant discharge port communicating with a coolant supplying path at the distal end face at the distal end of a hollow shank portion having a cutting chip discharge groove, whose section along the lengthwise direction is V-shaped, on the outer surface and having the interior thereof made into a coolant supplying path, wherein a blade portion of the cutter head is made of cemented carbide alloy, and at the same time, the guide pads that are brought into sliding contact with the inner circumference of a cutting bore are composed of a dissimilar material having higher hardness than the cemented carbide alloy.

06-11-2009

20090297285

DEEP HOLE DRILLING MACHINE - In a deep hole drilling machine employing an external system for supplying coolant to a drilling portion in which high drilling efficiency can be achieved even if the drilling hole is deep by enhancing the discharge performance of chips from the drilling portion without setting the supply pressure of coolant at a high level, a tubular boring head having discharging openings is attached to the distal end of a hollow boring bar having an interior serving as the chip discharge passage. Bypass holes are provided at a plurality of circumferential positions in the circumferential wall of the boring head to penetrate obliquely such that the outer opening is located closer to the distal end side of the head than the inner opening, and a part of the coolant supplied externally to the drilling portion side flows through the bypass holes into the boring head, thus generating attraction force to the discharge side and accelerating discharge of the chips.

12-03-2009

20100061817

Deep Hole Cutting Apparatus - A deep hole cutting apparatus has a chip-replaceable guide pad on a cutting head section. With the deep hole cutting apparatus, high machining accuracy can be obtained in a stable cutting status and the service life of the guide pad is lengthened. A guide pad (

03-11-2010

20100104385

Deep Hole Cutting Apparatus - A deep hole cutting apparatus has a chip-replaceable guide pad on a cutting head section. With the deep hole cutting apparatus, finish qualities of a cut hole to be formed can be improved and the service life of the guide pad is lengthened. A guide pad (

04-29-2010

20100135739

Gun Drill - A gun drill in which coolant delivered to a cutting part can be discharged intensively to a cutting chip discharge groove along with the chips, damage on the inner circumference of a drilled hole or fall of machining precision due to clogging with chips can be prevented, and cutting efficiency is enhanced by reducing rotary load and long lifetime can be attained. Coolant supply paths (

06-03-2010

20110008116

Gun Drill - A gun drill is capable of supplying a coolant sufficiently to a cutting region even when a cutting blade or a guide pad is of a brazed type, or when an opening angle of a cutting chip discharge groove is large or when a tool diameter is small and of achieving high cutting efficiency by discharging cutting chips efficiently from the cutting region. The gun drill includes coolant supply passages inside a tool shank and inside a cutting head. A lengthwise direction linear cutting chip discharge groove on an outer circumferential surface extends from a proximal side of the tool shank to a cutting head distal end. The cutting head is formed with a coolant lead-out groove extending from a head-lengthwise direction intermediate portion to the head distal end, at an outer circumferential surface portion at a back side relative to the cutting chip discharge groove. A coolant lead-out port communicating with a coolant supply passage is open at a proximal end side of the coolant lead-out groove.

01-13-2011

20110033255

Gun Drill - A gun drill has a cutting blade which attains high cutting efficiency without requiring exact positional accuracy at the time of brazing an associated cutting blade tip onto a cutting head. Thus, the cutting head can be manufactured easily and the cutting blade itself is also easily processed. The cutting blade is configured such that an inner end of a blade edge is spaced apart from a head central axis to form a non-cutting zone in the vicinity of the shaft center, a cutting blade side face at the inner end side constitutes an inclined surface which is inclined from the inner end to the head central axis side, and a uncut core of a work material generated in the non-cutting zone is broken off by press-contact of the inclined cutting blade side face during drilling operations.

02-10-2011

20110067927

Drill Head for Deep-Hole Drilling - Provided is a drill head for deep-hole drilling in which a cutting blade tip is mounted to face a cutting chip discharge port opened at a head distal end surface and a hollow inside is made into a cutting chip discharge passage communicating with the cutting chip discharge port, wherein high cutting efficiency based on good cutting chip dischargeability can be achieved and the cutting blade itself is also easily processed in terms of form. The drill head for deep-hole drilling is configured such that an inner end

03-24-2011

20110079445

Drill Head for Deep-Hole Drilling - Provided is a drill head for deep-hole drilling which does not generate such a disc that clogs a cutting chip discharge port when a head main body of the drill head penetrates a work material. The drill head is mounted with a central cutting blade tip

04-07-2011

20110091296

Throwaway Tip for Deep-Hole Drilling and Drill Head for Deep-Hole Drilling - A three-way indexable throwaway tip for deep-hole drilling can be used as a center cutting blade body for a drill head in either whole cutting type or uncut core break-off type applications. The throwaway tip for deep-hole drilling is of a thick plate body having a three-fold symmetry with three cutting sections that are rotationally spaced apart at a central angle of 120 degrees. When mounted on a drill head, one cutting section of the throwaway tip faces a drilling direction. The forward facing blade edge of that cutting section includes an inner blade edge shorter in blade length and an outer blade edge longer in blade length forming an apex. The outer blade edge is composed of two consecutive blade edge portions of a peak-side outer blade edge portion having a smaller outer blade edge angle and a corner-side outer blade edge portion having a larger outer blade edge angle.

04-21-2011

20110176878

Drill Head Manufacturing Method and Drill Head - A drill head manufacturing method calls for a cutting tip to be CVD coated, brazed to a distal end of a drill head, polished and then PVD coated. The process effectively utilizes features of a CVD coating, which renders a tool service life longer and enables a drill head more suitable for high-speed cutting to be manufactured. A cutting tip having been CVD coated with a hard material is brazed at a brazing temperature to a predetermined portion at a distal end side of a head main body. An outer diameter portion OD of the brazed tip about a rotation axis of the head main body is polished. Then, the cutting tip and the head main body are PVD coated with a hard material at a second temperature lower than the brazing temperature.